LM26420 (ACTIVE)

Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator

 

Recommended alternative parts

  • LM26420-Q1  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

Description

The LM26420 regulator is a monolithic, high-efficiency dual PWM step-down DC-DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.

Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • Qualified for Automotive Applications
  • AEC Q100-Qualified With the Following Results:
    • Device Temperature Grade 0 (Q0): –40°C to +150°C Ambient Operating Temperature Range
    • Device Temperature Grade 1 (Q1): –40°C to +125°C Ambient Operating Temperature Range
  • Compliant with CISPR25 Class 5 Conducted Emissions
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.8 V to 4.5 V
  • 2-A Output Current per Regulator
  • High Switching Frequency: 2.2 MHz (LM26420X)
        0.55 MHz (LM26420Y)
  • 0.8 V, 1.5% Internal Voltage Reference
  • Internal Soft Start
  • Independent Power Good and Precision Enable for Each Output
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection
  • Start-up into Pre-biased Output Loads
  • Regulators are 180° Out of Phase

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Parametrics Compare all products in Buck Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM26420 LM26420-Q1 LM26480 LM26480-Q1 TPS62420
3    3    2.8    2.8    2.5   
5.5    5.5    5.5    5.5    6   
0.8    0.8    1    1    0.6   
4.5    4.5    3.3    3.3    6   
2    2    1.5    1.5    0.6   
2    2    4    4    2   
550    550    2000    2000    2000   
2200    2200    2500    2500    2500   
0.9    0.9    0.033    0.033    0.032   
Enable
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Enable
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Enable
Light Load Efficiency
Power Good
Synchronous Rectification
UVLO Fixed   
N/A    Dynamic Voltage Scaling
Enable
Light Load Efficiency
Synchronous Rectification   
Current Mode    Current Mode    Voltage Mode    Voltage Mode    Voltage Mode   
98    98    100    100    100   
-40 to 125    -40 to 125    -40 to 85    -40 to 125
-40 to 85   
-40 to 85   
Catalog    Automotive    Catalog    Automotive    Catalog   
HTSSOP
WQFN   
HTSSOP
WQFN   
WQFN    WQFN    VSON   

Other qualified versions of LM26420

Version Part Number Definition
Automotive LM26420-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
WEBENCH® LM26420X
    Min   Max   Range  
  Vin1 V    3.00 – 5.50V  
  Vout1 V    0.80 – 4.50V  
  Iout1 A    ≤ 2.00A  

  Vin2 V    3.00 – 5.50V  
  Vout2 V    0.80 – 4.50V  
  Iout2 A    ≤ 2.00A  

  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
'Cvdd Cldo12 Rp L1_ch1 Cin_ch1 Rfbb_ch1 Rfbt_ch1 C1_ch1 Cout_ch1 L1_ch2 Cin_ch2 Rfbb_ch2 Rfbt_ch2 C1_ch2 Cout_ch2 Cin_ch3 Cout_ch3 Rfbt_ch3 Rfbb_ch3 Cin_ch4 Cout_ch4 Rfbt_ch4 Rfbb_ch4'
 
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